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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 19:59:03 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 19:59:03 +0000
commita848231ae0f346dc7cc000973fbeb65b0894ee92 (patch)
tree44b60b367c86723cc78383ef247885d72b388afe /src/util/sane_connect.c
parentInitial commit. (diff)
downloadpostfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.tar.xz
postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.zip
Adding upstream version 3.8.5.upstream/3.8.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/sane_connect.c')
-rw-r--r--src/util/sane_connect.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/util/sane_connect.c b/src/util/sane_connect.c
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+/*++
+/* NAME
+/* sane_connect 3
+/* SUMMARY
+/* sanitize connect() results
+/* SYNOPSIS
+/* #include <sane_connect.h>
+/*
+/* int sane_connect(sock, buf, len)
+/* int sock;
+/* struct sockaddr *buf;
+/* SOCKADDR_SIZE *len;
+/* DESCRIPTION
+/* sane_connect() implements the connect(2) socket call, and maps
+/* known harmless error results to EAGAIN.
+/* BUGS
+/* Bizarre systems may have other harmless error results. Such
+/* systems encourage programmers to ignore error results, and
+/* penalize programmers who code defensively.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <sys/socket.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "sane_connect.h"
+
+/* sane_connect - sanitize connect() results */
+
+int sane_connect(int sock, struct sockaddr *sa, SOCKADDR_SIZE len)
+{
+
+ /*
+ * XXX Solaris select() produces false read events, so that read() blocks
+ * forever on a blocking socket, and fails with EAGAIN on a non-blocking
+ * socket. Turning on keepalives will fix a blocking socket provided that
+ * the kernel's keepalive timer expires before the Postfix watchdog
+ * timer.
+ *
+ * XXX Work around NAT induced damage by sending a keepalive before an idle
+ * connection is expired. This requires that the kernel keepalive timer
+ * is set to a short time, like 100s.
+ */
+ if (sa->sa_family == AF_INET) {
+ int on = 1;
+
+ (void) setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
+ (void *) &on, sizeof(on));
+ }
+ return (connect(sock, sa, len));
+}